features: square corner stainless steel with stainless steel components (ansi k51071f) this single acting spring hinge is for automatic closing of door. it meets codes for hotels, motels, institutions, and commercial buildings. for maximum versatility, use all spring hinges or a combination of spring and ball bearing hinges. Do not use plain bearing hinges. full spring tension may not be required on all hinges. strong wind conditions, drafts, carpeting drag, twisted/misaligned frames, or weatherstripping on doors may require additional spring hinges
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